Pump.



J. WILLIAMS.

PUMP.

APPLIOATION FILED APR. 17, 1911.

Patented May 7, 1912.

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COLUMBIA PLANOGRAPH cm, WASHINGTON. D. c.

JAMES WILLIAMS, 0]? OLNEY, ENGLAND.

PUMP.

Specification of Letters Patent.

Application filed April 17, 1911.

Patented May 7, 1912. Serial No. 621,508.

To all whom it may concern:

Be it known that I, JAMES WILLIAMS, residing at Emberton Lodge, Newport Pagnell, ()lney, Bucks, England, a subject of the King of Great Britain, have invented a new and useful Improved Pump, of which the following is a specification.

This invention relates to a special design of pump adapted to deliver the liquid at a rate which is proportional to the angular movement of a rotary driver the proportionality being maintained not only in respect to the entire quantity delivered during a periodic movement but also in respect to any fraction of the period.

The accompanying drawing shows a contrivance as above described, partly in vertical section and partly in elevation.

15 15 are open ended cast iron cylinders each having, at the bottom thereof, a passage 16 leading to a tubular space 1 which, at its upper end, communicates with a carbureter through a non-return delivery valve 2, and, by a lower situated passage 3, is connected to a valve-box 4 which with an interposed non-return suction valve 5 is in communication with the tank, by means of a pipe 9. Into each of the cylinders 15 is placed a quantity of mercury and in the mercury is immersed a hollow closed bottomed cast-iron plunger 6 which loosely fits the cylinder 15 leaving an annular space between the plunger and the cylinder to be occupied by some of the mercury. Each plunger 6, near to its upper end, is pinjointed to an oscillating lever 7 by an interconnecting rod 8 the lever being pivotally mounted at 9 which is situated midway between the pin-connections of the rods 8, with the result that the lengths of the strokes of the two plungers are equal and the strokes are effected in reverse directions.

On the depression of a plunger some of the underlying mercury is displaced into the tubular space 1 in which, if the space were in free communication with the atmosphere, it would stand with its upper surface at the same level as the mercury in the annular space between the plunger 6 and the cylinder 15. When the tubular space is not open to the atmosphere the level of the mercury therein will deviate from that of the mercury within the cylinder 15 to an extent which will be proportional to the excess or deficiency of the pressure in 1 above or below that of the atmosphere. When the plunger 6 is raised the mercury level in 1 will fall and, inasmuch as the delivery valve- 2 will then close, there will be a tendency to the production of a partial vacuum in 1 which. will cause the suction valve 5 to lift and admit carbureting liquid from the tank to the space 1 above the mercury. During the operation of the suction-stroke of one plunger, the other will be performing its delivery stroke, in which the carbureting liquid, drawn through the suction valve 5 in the previous stroke, will be forced past the delivery valve Qinto a tube 10 connecting the two valve-boxeswhich contain the delivery-valves 2 2. From 10 the carbureting liquid is conducted by a pipe 11 to a carbureter.

The lever 7 derives its angular oscillation from a rotor through the medium of a connecting rod 12 which is attached to 7 by a pin 13 so mounted on the lever 7 as to permit its distance from 9 to be adjustedwith facility during the operation of the machine, as for example by means of a guided nut, a screw which fits therein and a handwheel 14 secured to the screw.

Such a pump being employed to deliver carbureting liquid to a carbureter which is supplied with air by the rotary blower at a rate which is proportional to the angular velocity of the rotary blower, and the rotary blower and oscillating lever being interconnected by a crank-and-connecting-rod mech anism, there would be a deviation from uniform proportionality of carbureting liquid to air, due to the known variation in the velocity-ratio of the longitudinal rate of displacement of the plunger to the linear speed of the crank-pin, unless rectified as follows:

The transverse section of the plunger instead of being constant, varies in such a manner, that for every unit angle turned through by the rotor, the simultaneous displacement of the mercury by the plunger is constant. At mid-stroke, when the velocityratio of plunger to crank-pin is maximum, the section of the plunger is a minimum, the section increasing gradually toward the portions which are at the mercury level at the two ends of the stroke.

The mercury sealed valves 2 each consists of an inverted cup 2, the lower border of which depends into an annular trough or cup situated at the ends of the delivery pipe 10 and into which cup is extended upward the tube 1 in which latter a stem secured to the valve cup 2 is guided. As

' shown, the bottom of the trough or cup is a pair of vertical cylinders containing mercury the exposed surface areas of which mercury vary from a maximum at midstroke to a minimum at the two ends of the stroke, closed-bottomed plungers loosely fitting said cylinders, vertical pipes communicating with the lower ends of said cylinders, supply pipes for carbureting liquid connected to said vertical pipes, non-return valves in said supply pipes, delivery pipes for carbureting liquid connected to said vertical pipes, non-return valves in said delivery pipes, a pivoted oscillating member and means connecting said plungers to said member on opposite sides of the pivot thereof.

2. In an air carbureting apparatus, a pump for the carbureting liquid comprising a pair of vertical cylinders containing mercury, closed-bottomed plungers loosely fitting said cylinders the sectional areas of which plungers at the mercury levels vary from a minimum at midstroke to a maximum at the two ends of the stroke, vertical pipes communicating with the lower ends of said cylinders, supply pipes for carbureting liquid connected to said vertical pipes, nonreturn valves in said supply pipes, delivery pipes for carbureting liquid connected to said vertical pipes, non-return valves in said delivery pipes, a pivoted oscillating member and means connecting said plungei's to said member on opposite sides of the pivot thereof.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JAMES WILLIAMS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. C. 

